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Estimate Theater

Scene 1: Tragedy We’re in a retrospective. This was after a major event, so we discussed a few of the things that have gone awry, like delayed integration with other teams, unfinished stories, and then how we’re going to fix them. All in all, a good open discussion. And then, as we’re getting ready to close the session, one of the ...

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Web service application with JAX-WS and Spring

spring-interview-questions-answers

1. Introduction It has been a long wait, but I am finally publishing a tutorial on creating the first SOAP based web service application with Spring. JAX-WS (Java API for XML Web Services) is a set of APIs for creating web services in XML format, which we also most commonly call as SOAP based web service, which hope we all are aware of ...

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C code always runs way faster than Java, right? Wrong!

So we all know the prejudice that Java being interpreted is slow and that C being compiled and optimized runs very fast. Well as you might know, the picture is quite different. TL;DR Java is faster for constellations, where the JIT can perform inlining as all methods/functions are visible whereas the C compiler cannot perform optimizations accross compilation units (think ...

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Improved Documentation of HotSpot Options in Java 8

One of the small but welcome features introduced with Oracle’s HotSpot implementation of Java 8 is the addition of many common HotSpot Java launcher (java) options/flags to the launcher’s documentation. In the past, a developer interested in even some fairly common HotSpot JVM options has had to potentially look in multiple different sources to find “official” documentation on these flags. ...

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Enable Docker Remote API on Docker Machine on Mac OS X

Docker daemon provides a Remote REST API. This API is used by the Client to communicate with the engine. This API can be also be invoked by by other tools, such as curl or Chrome Postman REST Client. If you are creating Docker daemons using Docker Machine on OSX Mavericks, then getting this API to work is a bit tricky. This blog will ...

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Pills of Eventual Consistency

A question raises spontaneously: why Eventual Consistency? Isn’t ACID enough? Let’s try to understand the need for Eventual Consistency guarantees when we talk about Distributed Computing on large scale, and of course Data is involved. With the advent of Internet and Cloud services, Databases and more in general Data Storage technologies have undergone a radical change: scaling out systems over replicated ...

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Abstract Factory or Factory Method?

Today I would like to tell you about Factory Method Pattern and Abstract Factory Pattern. The purpose of the article is to help you recognize places where one of them should be used. What will we talk about? Those patterns are one of the Creational Patterns and as the name suggest their main responsibility is creating the objects. However, we ...

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The spectacular instability of good code structure

A previous post noted that source code structure decays because there are many more ways to build a poorly structured system than a well-structured one, and so, without strict structural guidelines, a system will inevitably explore deeper into disorder state-space until it finds the dark nirvana of ball-of-mud-ness from which few escape. This short post merely demonstrates the phenomenon graphically. ...

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Apache Hadoop Tutorial – The ULTIMATE Guide (PDF Download)

EDITORIAL NOTE: Apache Hadoop is an open-source software framework written in Java for distributed storage and distributed processing of very large data sets on computer clusters built from commodity hardware. All the modules in Hadoop are designed with a fundamental assumption that hardware failures are common and should be automatically handled by the framework. Hadoop has become the de-facto tool ...

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